Update check_requirements(args, cmds='')

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Updates to dependency management and installation in the YOLOv5 codebase.

📊 Key Changes

• Adjusted the check_requirements function in utils/general.py to handle input types more robustly.
• Standardized argument cmds within check_requirements and export_engine functions to be a string instead of a tuple.
• Modified path handling to ensure requirement files are correctly resolved.

🎯 Purpose & Impact

• Ensure smoother installation and setup experience for YOLOv5 users by improving dependency checks and updates. 🛠️
• Potential reduction in installation errors and confusion, leading to a more user-friendly experience when setting up YOLOv5. 🚀
• Minor improvements to code maintainability and readability, which benefits developers working on the project. 👨‍💻👩‍💻